Apple's Jade claimed her 10th Grade One win by beating 2018 winner Supasundae in the Irish Champion Hurdle.
The 8-11 favourite, ridden by Jack Kennedy, came home 16 lengths clear of Supasundae (4-1) with Petit Mouchoir (12-1) third at Leopardstown.
Meanwhile at Sandown, Buveur D'Air remained on course for a Cheltenham Champion Hurdle hat-trick by winning the Contenders Hurdle convincingly.
The Nicky Henderson-trained horse is still 13-8 favourite for the Festival.
The eye-catching win by Apple's Jade, regarded as a superstar of Irish racing, will increase speculation about the plans for the seven-year-old mare.
Her Giggingstown Stud owners played down the idea of going for the Champion Hurdle.
When asked if Saturday's win makes a Champion Hurdle bid likely, trainer Gordon Elliott said: "We will get her home and discuss it with the owners. She's entered and we won't rule anything out.
"She's in the Champion Hurdle, she's in the Mares' Hurdle and she's in the Stayers' Hurdle. She could run in any of them and we'll see what happens.
"Everything is a possibility now."
Min (4-9 favourite) repeated his 2018 success by winning the Dublin Chase, which was the feature of Saturday's Leopardstown programme.
With last year's runner-up Simply Ned out injured and Arkle Chase winner Footpad not among the final declarations, the Willie Mullins-trained eight-year-old saw off Ordinary World and Saint Calvados.
Min is now expected to again go for the Queen Mother Champion Chase, having finished runner-up to Altior last year.